MOBILE, Alabama - Israeli military experts Sunday worked around the clock, according to CNN, to examine the remains of a mysterious drone that was shot down after penetrating Israeli airspace from the Mediterranean Sea.

The Israeli military announced Saturday that the unmanned aerial vehicle was shot down over the northern Negev Desert. They say the drone did not take off from Gaza, leading them to consider the possibility that it originated in Lebanon.

Israeli security experts point the finger at Israel's longstanding rival Hezbollah, the Shiite militia based in southern Lebanon.

While Israel has yet to officially announce who it sees as responsible for the penetration into its airspace, Lebanon's national news agency on Sunday reported that Israeli fighter jets have flown into Lebanese airspace, causing sonic booms in the area.